Water seal equipment

Abstract

The utility model provides water seal equipment, which comprises a water / liquid seal tank, a water / liquid adding valve and a draining valve, the top of the water / liquid seal tank is connected with material gas, a first liquid level meter is arranged in the water / liquid seal tank, a second liquid level meter is arranged on the outer side of the water / liquid seal tank, the bottom of the first liquid level meter is close to the bottom of the water / liquid seal tank and is communicated with the inside of the water / liquid seal tank, and the draining valve is arranged in the water / liquid seal tank. The upper end of the first liquid level meter extends out of the water / liquid sealing tank, the upper end of the first liquid level meter is provided with a change-over valve, the lower end of the second liquid level meter is close to the bottom of the water / liquid sealing tank, the upper end of the second liquid level meter is close to the top of the water / liquid sealing tank, and the two ends of the second liquid level meter are communicated with the water / liquid sealing tank respectively. The processing cost, equipment and occupied space are saved, and maintenance and management are facilitated; the first liquid level meter and the second liquid level meter are arranged inside and outside the water / liquid sealing tank respectively, accurate reading can be achieved, the pressure intensity is accurately calculated according to the liquid level difference, and accurate control over positive and negative pressure values is achieved.

Description

Technical Field

[0001] The utility model relates to the field of water seals, in particular to a water seal device. Background Art

[0002] Liquid seal devices are common in chemical production equipment. Generally, water or other non-volatile liquids are used as sealing liquid to seal the gas generated in the process. The sealing liquid is required not to dissolve the gas (such as non-condensable gas, air, carbon dioxide, etc. generated in the production process) to prevent gas from overflowing. The pressure of the liquid seal is generally below 100KPa.

[0003] The most common process design uses two storage tanks in series (such as Figure 1 ), one is a water / liquid seal tank, and the other is a gas phase buffer tank. When the material gas is under positive pressure, the gas first passes through the buffer tank, and the gas is sealed by the water / liquid seal tank. The maximum allowable pressure of the gas is controlled by the liquid level in the water / liquid seal tank. Generally, it is controlled to the height of the full tank liquid level, and the corresponding water / liquid level is converted into the maximum pressure of gas sealing (generally, the pressure of the sealed gas is lower than this pressure value). When the gas pressure exceeds the water / liquid seal pressure, the water / liquid seal will be broken and overflow into the atmosphere, and the water / liquid seal will fail. At the same time, when the gas side pressure reaches the negative pressure that overcomes the corresponding liquid level height of the water / liquid seal tank, the sealing liquid in the water / liquid seal tank can be sucked into the buffer tank through the buffer tank. At this time, the water / liquid seal fails, that is, the vacuum is broken, and the atmosphere is sucked into the gas side from the water / liquid seal tank.

[0004] The water seal device is simple in design and can prevent water or other sealing liquids from being sucked into the gas side due to excessive negative pressure on the gas side, causing contamination of the process. However, the water seal device takes up a large space, the pressure cannot be quantified, and it can only be adjusted once and cannot be adjusted later according to process requirements. Once the positive pressure water / liquid seal fails, the material gas will leak directly into the atmosphere, which may cause environmental pollution. Or once the negative pressure water / liquid seal fails (often called "breaking the vacuum"), the atmosphere will directly enter the material system and encounter flammable and explosive media, which may cause fire and explosion. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a water seal device that can solve the problem that the water seal device occupies a large space and cannot quantify the pressure.

[0006] To this end, the utility model adopts the following technical solutions:

[0007] A water seal device comprises a water / liquid seal tank, a water / liquid filling valve and a drain valve, wherein the top of the water / liquid seal tank is connected to material gas, a first liquid level gauge is arranged inside the water / liquid seal tank, a second liquid level gauge is arranged outside the water / liquid seal tank, the bottom of the first liquid level gauge is close to the bottom of the water / liquid seal tank and is connected to the inside of the water / liquid seal tank, the upper end of the first liquid level gauge extends out of the water / liquid seal tank, a conversion valve is arranged at the upper end of the first liquid level gauge, the lower end of the second liquid level gauge is close to the bottom of the water / liquid seal tank, the upper end of the second liquid level gauge is close to the top of the water / liquid seal tank, and both ends of the second liquid level gauge are respectively connected to the water / liquid seal tank.

[0008] On the basis of adopting the above technical solutions, the present invention can also adopt the following further technical solutions, or use these further technical solutions in combination:

[0009] One side of the water / liquid seal tank is also connected with an overflow valve.

[0010] The overflow valve is located between the top of the water / liquid seal tank and the top of the second liquid level gauge.

[0011] The drain valve is located between the bottom of the first liquid level gauge and the bottom of the water / liquid seal tank.

[0012] The first liquid level gauge is a top-mounted float liquid level gauge.

[0013] The first liquid level meter is an insertion type liquid level meter.

[0014] The second liquid level gauge is a magnetic flap liquid level gauge.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects: only one water / liquid sealing tank is used, which plays the role of positive and reverse sealing at the same time, saving processing costs, equipment and occupied space, and facilitating maintenance and management; a first liquid level gauge and a second liquid level gauge are respectively arranged inside and outside the water / liquid sealing tank, which can accurately read the readings, accurately calculate the pressure according to the liquid level difference, and realize precise control of positive and negative pressure values; it plays a better sealing role, avoiding the risk of environmental pollution or air entering the material system to cause system pollution or fire and explosion in flammable and explosive environments after the water / liquid seal fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an existing liquid sealing device.

[0017] Figure 2 A schematic structural diagram of the utility model. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent elements with the same or similar functions. However, it should be understood that the accompanying drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. In order to better illustrate the present embodiment, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted, and the positional relationship described in the accompanying drawings is only used for illustrative purposes and cannot be understood as limitations on the present invention.

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0020] The utility model provides a water seal device, comprising a water / liquid seal tank 1, a water / liquid adding valve 2 and a drain valve 3, the top of the water / liquid seal tank 1 is connected to material gas, a first liquid level gauge 4 is arranged inside the water / liquid seal tank 1, a second liquid level gauge 5 is arranged outside the water / liquid seal tank 1, the bottom of the first liquid level gauge 4 is close to the bottom of the water / liquid seal tank 1 and is communicated with the inside of the water / liquid seal tank 1, the upper end of the first liquid level gauge 4 extends out of the water / liquid seal tank 1, a conversion valve 6 is arranged on the upper end of the first liquid level gauge 4, the lower end of the second liquid level gauge 5 is close to the bottom of the water / liquid seal tank 1, the upper end of the second liquid level gauge 5 is close to the top of the water / liquid seal tank 1, and both ends of the second liquid level gauge 5 are respectively communicated with the water / liquid seal tank 1.

[0021] In this embodiment, by setting an internal and external double liquid level gauge (i.e., a first liquid level gauge 4 and a second liquid level gauge 5) on a water / liquid sealing tank 1 (selected according to the process conditions, mainly considering the height of the tank body where the liquid level can be measured), the pressure in the water / liquid sealing tank 1 is accurately quantified and subsequent adjustments are made;

[0022] A sealing medium of a certain liquid level height is added to the water / liquid seal tank 1 through the water / sealing liquid pipeline connected to the water / liquid adding valve 2 (the pressure is calculated and converted according to the density and height of the medium, P=ρgh). When it acts as a positive pressure, the material gas overcomes the gravity of the liquid column to raise the liquid in the water / liquid seal tank 1 along the built-in liquid level gauge (the first liquid level gauge 4). The height difference between the inner and outer liquid level gauges (i.e., the first liquid level gauge 4 and the second liquid level gauge 5) is used to calculate the magnitude of the positive pressure, and at the same time, the liquid level of the second liquid level gauge 5 is guaranteed to be 0; when it acts as a negative pressure, a negative pressure is generated on the material gas side to overcome the pressure of the liquid column and absorb the liquid upward. At this time, the conversion valve 6 at the top of the first liquid level gauge 4 needs to be opened to connect with the atmosphere. At this time, the liquid level of the first liquid level gauge 4 drops and is lower than the liquid level of the second liquid level gauge 5. The pressure difference between the two is the negative pressure value, but it should be noted that the first liquid level gauge 4 must be greater than 0 to ensure that the liquid seal does not fail, so as to avoid air entering the material side and mixing, causing other consequences.

[0023] One side of the water / liquid seal tank 1 is also connected to an overflow valve 7 .

[0024] The overflow valve 7 is located between the top of the water / liquid seal tank 1 and the top of the second liquid level gauge 5 .

[0025] The drain valve 3 is located between the bottom of the first liquid level gauge 4 and the bottom of the water / liquid seal tank 1 .

[0026] By setting the drain valve 3 and the overflow valve 7, the upper limit liquid level value of the positive and negative pressure of the water / liquid seal tank 1 can be adjusted.

[0027] The first liquid level gauge 4 is a top-mounted float level gauge or an insertion level gauge. Figure 2 In the process, a top-mounted float level gauge is used.

[0028] The second level gauge 5 is a magnetic flap level gauge, such as Figure 2 It can be seen that a valve is provided between the magnetic flap level gauge and the water / liquid seal tank 1 .

[0029] The structures and usage of top-mounted float level gauges, insertion level gauges and magnetic flap level gauges are all prior art and will not be described in detail here.

[0030] The bottom of the water / liquid sealing tank 1 mentioned above must be ensured to be below the liquid inside the water / liquid sealing tank 1 .

[0031] According to the description and drawings of the utility model, those skilled in the art can easily manufacture or use a water seal device of the utility model, and can produce the positive effects recorded in the utility model.

[0032] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two mechanisms, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0033] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "inside", "horizontal", "end", "length", "outer end", "left", "right" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the mechanism or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The terms "first" and "second" are also used only for the simplicity of description, and do not indicate or imply relative importance.

[0034] Furthermore, in practicing the claims of the present invention, those skilled in the art may understand and affect variations to the disclosed embodiments by studying the drawings, disclosure, and appended claims. In addition, in the claims and the specification, words such as "comprises", "comprising", etc. do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0035] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the present invention are covered by the scope of the claims of the present invention and will not be listed one by one here.

Claims

1. A water seal device, comprising a water / liquid seal tank (1), a water / liquid filling valve (2) and a drain valve (3), characterized in that: The top of the water / liquid seal tank (1) is connected to the material gas, a first liquid level gauge (4) is provided inside the water / liquid seal tank (1), a second liquid level gauge (5) is provided outside the water / liquid seal tank (1), the bottom of the first liquid level gauge (4) is close to the bottom of the water / liquid seal tank (1) and is connected to the inside of the water / liquid seal tank (1), the upper end of the first liquid level gauge (4) extends out of the water / liquid seal tank (1), a conversion valve (6) is provided at the upper end of the first liquid level gauge (4), the lower end of the second liquid level gauge (5) is close to the bottom of the water / liquid seal tank (1), the upper end of the second liquid level gauge (5) is close to the top of the water / liquid seal tank (1), and both ends of the second liquid level gauge (5) are respectively connected to the water / liquid seal tank (1).

2. A water seal device as claimed in claim 1, characterized in that: One side of the water / liquid seal tank is also connected to an overflow valve (7).

3. A water seal device as claimed in claim 2, characterized in that: The overflow valve (7) is located between the top of the water / liquid seal tank (1) and the top of the second liquid level gauge (5).

4. A water seal device as claimed in claim 1, characterized in that: The drain valve (3) is located between the bottom of the first liquid level gauge (4) and the bottom of the water / liquid seal tank (1).

5. A water seal device as claimed in claim 1, characterized in that: The first liquid level gauge (4) is a top-mounted float liquid level gauge.

6. A water seal device as claimed in claim 1, characterized in that: The first liquid level meter (4) is an insertion type liquid level meter.

7. A water seal device as claimed in claim 1, characterized in that: The second liquid level gauge (5) is a magnetic flap liquid level gauge.

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